fn main() {
	let mut ab = String::new();
	std::io::stdin().read_line(&mut ab).ok();
	let mut ab: Vec<i64> = ab.trim().split_whitespace()
		.map(|e| e.parse().unwrap()).collect();
	let a = ab[0];
	let b = ab[1];

	let fact = |x| {
		let mut y = 1;
		for i in 1..=x { y *= i; }
		y
	};
	
	println!("{}", fact(a | b));
}